In Surah at Taubah, ayah 24, Allah has clearly said that IF you place priority on your parents, your families, your homes, and your businesses OVER Allah + Rasul + Jihad , then you are a fasiq [evil-doer]. Allah says in Surah At-taubah again that: "...those who Believe in Allah and yaum al-Qiyamah would never seek ANY excuse to stay back from fighting. Only those who deisbelieve or those who doubt would ask an excuse. And so in their doubts they sway to and fro."
And surely there are the Shuhadah, may Allah accept them, who have the honor of all sins except debt, forgiven at the first drop of their blood. A blood, the smell of which is better that any perfume in this world.
The Koran remains for all Muslims, not just "fundamentalists," the uncreated word of God Himself. It is valid for all times and places; its ideas are absolutely true and beyond all criticism. To question it is to question the very word of God, and hence blasphemous. A Muslim's duty is to believe it and obey its divine commands.
Any religion that requires total submission and surrender without thought is not likely to produce people capable of free, independent and critical thought.